Just because you see tilted rocks and (apparently) flat lying rocks in the same view doesn't automatically mean angular unconformity. You might, for example, be seeing a tilted limb of an anticline in the foreground and the flat lying crest of the same anticline in the distance. I think you need to see more detail to make a judgement.
Also, topography/perspectives can create illusions. You can look at a rock face and the bedding may appear to be flat, when it is indeed dipping steeply. This is the difference between apparent dip and true dip.
I've been through that area of Wyoming, albeit 20+ years ago. I think you MIGHT have an example of a monocline there.